In finding cases, extensive co-operation should be invited; almost every one whose work brings him into contact with numbers of people, knows one or two among them who are tuberculous. Thus settlement workers, school teachers, school attendance officers, juvenile court officers, clergymen, Salvation Army workers, and so forth, are all people whose aid and interest should be solicited. It makes no difference whether or not the case is positively diagnosed—any sick person, with the symptoms of a consumptive, is a person whose case should be looked into. It is the nurse’s business to obtain the diagnosis. =Dispensaries.= If there is a hospital or dispensary (not necessarily a tuberculosis dispensary), the nurse should visit these institutions and ask to have all positive and suspicious cases referred to her. Since the patients who come to these places are usually those of the poorer classes, the doctors will not be likely to object to giving their names to the nurse. Indeed, they may be glad to accept the assistance she offers. One visit to these institutions, however, is not enough. Every week or two the nurse must present herself and renew her request for patients—she must not trust to the busy physician to report them by letter or telephone. Even when tuberculosis work is conducted on a large scale, as in Baltimore, it is always part of the nurse’s duty to visit these institutions regularly, to remind the doctors of their existence and of their unquenchable desire for more patients. =Patients’ Families and Friends.= After the nurse is well established, and her position in the community recognized and assured, she will find that a certain number of new cases are referred to her through the families and friends of those already on her visiting list. This is a high tribute, and should be valued accordingly. She should not rely entirely upon this voluntary assistance, however, but from time to time should question her patients, and find out whether they have any friends who are ill, who would like to be visited. Surprising revelations often follow. There was in Baltimore one old coloured woman who took special pride in discovering patients, and who made an indefatigable agent in hunting up cases in the neighbourhood. The accuracy of her diagnosis was wonderful—her son had died of tuberculosis, so she knew all the symptoms, and she did not refer us to a single case, which, upon examination, failed to be tuberculous. We must remember that while in its early stages tuberculosis is difficult to detect, when it is so advanced that a layman can recognize it, in nine times out of ten he is right. And as these advanced cases are the chief distributors of the disease, the alert nurse should be keen to learn of these patients through any source that presents itself. Of course many calls from such sources send one on mere wild-goose chases, but it is better to go on a dozen fruitless errands, than to overlook one real case of tuberculosis.